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8. Connect "orange lead" with the fork terminal to
either the "G" terminal of the low voltage strip
(will ventilate anytime there is a call for the
blower), or the "F" terminal (can be used as a
junction point for on-demand ventilation with a
capable thermostat or occupancy sensor).
9. The pink, purple and black wires will pass through
bushing on opposite side of low voltage box where
they entered, and will run up the wire loom to the
step-control assembly for connection installed in
Step #10, Figure 4 following the wiring diagram
(enclosed in Literature Assembly or on ventilator).
10. Locate the step control assembly packaged with the
assembly. This assembly will install in the upper
left-hand corner of the control panel by aligning
the plastic standoffs with pre-punched holes in the
control panel. See Figure 4.
11. Route the wires from the step control assembly
down the control panel through the wire looms,
and route them into the low voltage box through
the bushing. See Figure 4. Make connections
following the wiring diagram (enclosed in
Literature Assembly or on ventilator).
12. Replace left filter support, filter and four (4) screws
in condenser grille.
13. Reinstall the blower access panel at top of unit and
secure with sheet metal screws.
14. Ventilator checkout – (Note: It may be more
efficient to disconnect the thermostat from the
low voltage terminal strip and use a set of jumper
wires to perform these steps.)
A. Resupply power to the unit.
B. Energize the evaporator blower by switching
thermostat to the manual fan position with
heat/cool in OFF position. (Jumper "R" to "G")
C. Ventilator should open to the position set by
"R1" potentiometer on step control board. (See
Figure 5.)
D. Now energize Stage #1 cooling/heating by
switching the thermostat to the corresponding
mode and setting the temperature offset slightly
beyond the actual room temperature. (Jumper
"R" to "G" and "Y1")
E. Ventilator should now open to the position set
by "R2" potentiometer on step control board.
(See Figure 5.)
Manual
2100-457D
Page
7 of 16
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